<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>💗💗</title>
    <link rel="icon" href="/aaaa/favicon.ico">
    <style>
        *{margin:0; padding:0;}
        body{ background-color: #1E1E1E;     }
    </style>
</head>
<body>

<canvas id="drawHeart"></canvas>

<script>
    var hearts = [];
    var canvas = document.getElementById('drawHeart');
    var wW = window.innerWidth;
    var wH = window.innerHeight;
    // 创建画布
    var ctx = canvas.getContext('2d');
    // 创建图片对象
    var heartImage = new Image();
    heartImage.src = '/aaaa/favicon.ico'; // 头像地址
    var num = 100;

    init();

    window.addEventListener('resize', function(){
        wW = window.innerWidth;
        wH = window.innerHeight;
    });
    // 初始化画布大小
    function init(){
        canvas.width = wW+100;
        canvas.height = wH+100;
        for(var i = 0; i < num; i++){
            hearts.push(new Heart(i%5));
        }
        requestAnimationFrame(render);
    }

    function getColor(){
        var val = Math.random() * 10;
        if(val > 0 && val <= 1){
            return '#00f';
        } else if(val > 1 && val <= 2){
            return '#f00';
        } else if(val > 2 && val <= 3){
            return '#0f0';
        } else if(val > 3 && val <= 4){
            return '#368';
        } else if(val > 4 && val <= 5){
            return '#666';
        } else if(val > 5 && val <= 6){
            return '#333';
        } else if(val > 6 && val <= 7){
            return '#f50';
        } else if(val > 7 && val <= 8){
            return '#e96d5b';
        } else if(val > 8 && val <= 9){
            return '#5be9e9';
        } else {
            return '#d41d50';
        }
    }

    function getText(){
        var val = Math.random() * 10;
        if(val > 1 && val <= 3){
            return '爱你一辈子';
        } else if(val > 3 && val <= 5){
            return '感谢你';
        } else if(val > 5 && val <= 8){
            return '喜欢你';
        } else{
            return 'I Love You';
        }
    }

    function Heart(type){
        this.type = type;
        // 初始化生成范围
        this.x = Math.random() * wW;
        this.y = Math.random() * wH;

        this.opacity = Math.random() * .5 + .5;

        // 偏移量
        this.vel = {
            x: (Math.random() - .5) * 5,
            y: (Math.random() - .5) * 5
        }

        this.initialW = wW * .5;
        this.initialH = wH * .5;
        // 缩放比例
        this.targetScale = Math.random() * .15 + .02; // 最小0.02
        this.scale = Math.random() * this.targetScale;

        // 文字位置
        this.fx = Math.random() * wW;
        this.fy = Math.random() * wH;
        this.fs = Math.random() * 10;
        this.text = getText();

        this.fvel = {
            x: (Math.random() - .5) * 5,
            y: (Math.random() - .5) * 5,
            f: (Math.random() - .5) * 2
        }
    }

    Heart.prototype.draw = function(){
        ctx.save();
        ctx.globalAlpha = this.opacity;
        ctx.drawImage(heartImage, this.x, this.y, this.width, this.height);
        ctx.scale(this.scale + 1, this.scale + 1);
        if(!this.type){
            // 设置文字属性
            ctx.fillStyle = getColor();
            ctx.font = 'italic ' + this.fs + 'px sans-serif';
            // 填充字符串
            ctx.fillText(this.text, this.fx, this.fy);
        }
        ctx.restore();
    }
    Heart.prototype.update = function(){
        this.x += this.vel.x;
        this.y += this.vel.y;

        if(this.x - this.width > wW || this.x + this.width < 0){
            // 重新初始化位置
            this.scale = 0;
            this.x = Math.random() * wW;
            this.y = Math.random() * wH;
        }
        if(this.y - this.height > wH || this.y + this.height < 0){
            // 重新初始化位置
            this.scale = 0;
            this.x = Math.random() * wW;
            this.y = Math.random() * wH;
        }

        // 放大
        this.scale += (this.targetScale - this.scale) * .1;
        this.height = this.scale * this.initialH;
        this.width = this.height * 1.4;

        // -----文字-----
        this.fx += this.fvel.x;
        this.fy += this.fvel.y;
        this.fs += this.fvel.f;

        if(this.fs > 50){
            this.fs = 2;
        }

        if(this.fx - this.fs > wW || this.fx + this.fs < 0){
            // 重新初始化位置
            this.fx = Math.random() * wW;
            this.fy = Math.random() * wH;
        }
        if(this.fy - this.fs > wH || this.fy + this.fs < 0){
            // 重新初始化位置
            this.fx = Math.random() * wW;
            this.fy = Math.random() * wH;
        }
    }

    function render(){
        ctx.clearRect(0, 0, wW, wH);
        for(var i = 0; i < hearts.length; i++){
            hearts[i].draw();
            hearts[i].update();
        }
        requestAnimationFrame(render);
    }
</script>
</body>
</html>